1

In short, yes:
Dropping HCG levels mean an abnormal pregnancy if they are measured during the early weeks of pregnancy, this does not hold true if measured later in pregnancy when levels can drop and be normal. There are occasional time when they may not rise as expected when there are significant maternal illnesses as well.
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Mouth (mouth) " n. Pl. Mouths 1. A. The body opening through which an animal takes in food. B. The cavity lying at the upper end of the alimentary canal, bounded on the outside by the lips and inside by the oropharynx and containing in higher vertebrates the tongue, gums, and teeth. C. This cavity regarded as the source of sounds and speech. D. The opening to any cavity or canal in an organ ".
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5

HCG:
While there can be other conditions that cause a positive HCG in urine, pregnancy would be by far the most common reason for this. There is such thing as a false positive though standard testing by hospital grade tests are generally pretty good. See your doctor for more info.
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12

50% up every 2 days:
Most healthy early pregnancies have a HCG level that rises by at least 50% every 2 days - it's often faster than this and it may double or nearly double every 2 days. It depends how far along you are too - no hormone can go up exponentially forever and HCG peaks at around 10 weeks.
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13

Ok:
Most ivf clinics only measure HCG levels approximately 9 days after a day 5 embryo transfer. However, some clinics feel that the combination of HCG levels and Progesterone levels have a more predictive value of a good pregnancy than HCG levels alone. Personally, we only measure hcg. Hope this helps and good luck.
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15

Multiple gestation:
The hcg has risen faster than expected. While this can be due to a molar pregnancy, it can also be a sign of a multiple gestation. An ultrasound can give you the answer. Both are seen well on ultrasound. Good luck.
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19

Miscarriage :
The HCG levels can rise quite high with a blighted ovum, but these levels do not rise normally. The level of HCG does not tell if you have a blighted ovum or what is called a missed abortion by some. If your HCG level is doubling every 48 hours in the first weeks of pregnancy, your pregnancy is most likely normal - if not, probably a miscarriage.
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When your due date arrives, you will be more than ready to have your baby! Most women deliver the baby somewhere between 37 and 42 weeks. According to the American College of Obstetricians and Gynecologists, only 5% of babies arrive on the exact due date. Approximately 7% of babies are not delivered by 42 weeks, and when that happens, it is referred to as a "post-term pregnancy."
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Beta-HCG is a pregnancy hormone. It is expected to double every 2 days in a normal pregnancy. If the level rises too slowly, it may indicate an ectopic pregnancy. If it drops, it usually means a miscarriage has occurred.
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